期刊
JOURNAL OF BIOMECHANICS
卷 49, 期 16, 页码 4002-4008出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2016.10.029
关键词
Primary stability; Micromotion; Femoral stem; Micro-CT; Total hip replacement
资金
- Swiss National Science Foundation [141152]
- SwissLife Jubilaumstiftung
A good primary stability of cementless femoral stems is essential for the long-term success of total hip arthroplasty. Experimental measurement of implant micromotion with linear variable differential transformers is commonly used to assess implant primary stability in pre-clinical testing. But these measurements are often limited to a few distinct points at the interface. New techniques based on micro computed tomography (micro-CT) have recently been introduced, such as Digital Volume Correlation (DVC) or markers-based approaches. DVC is however limited to measurement around non-metallic implants due to metal-induced imaging artifacts, and markers-based techniques are confined to a small portion of the implant. In this paper, we present a technique based on micro-CT imaging and radiopaque markers to provide the first full-field micromotion measurement at the entire bone-implant interface of a cementless femoral stem implanted in a cadaveric femur. Micromotion was measured during compression and torsion. Over 300 simultaneous measurement points were obtained. Micromotion amplitude ranged from 0 to 24 mu m in compression and from 0 to 49 mu m in torsion. Peak micromotion was distal in compression and proximal in torsion. The technique bias was 5.1 mu m and its repeatability standard deviation was 4 mu m. The method was thus highly reliable and compared well with results obtained with linear variable differential transformers (LVDTs) reported in the literature. These results indicate that this micro-CT based technique is perfectly relevant to observe local variations in primary stability around metallic implants. Possible applications include pre-clinical testing of implants and validation of patient-specific models for pre-operative planning. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据